CN113294227B - Device for improving SDPF low-temperature starting performance and control method thereof - Google Patents
Device for improving SDPF low-temperature starting performance and control method thereof Download PDFInfo
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- CN113294227B CN113294227B CN202110737530.4A CN202110737530A CN113294227B CN 113294227 B CN113294227 B CN 113294227B CN 202110737530 A CN202110737530 A CN 202110737530A CN 113294227 B CN113294227 B CN 113294227B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 8
- 239000011148 porous material Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 238000002474 experimental method Methods 0.000 claims description 2
- 239000000446 fuel Substances 0.000 claims description 2
- 239000000969 carrier Substances 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 21
- 239000003054 catalyst Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000013618 particulate matter Substances 0.000 description 4
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000004202 carbamide Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Processes For Solid Components From Exhaust (AREA)
Abstract
The invention belongs to the field of power machinery and engineering, and on one hand, the invention provides a device for improving the low-temperature starting performance of SDPF, which comprises an SDPF carrier, an actuator 2 and a controller 1; the actuator 2 is arranged at the inlet side of the SDPF carrier, the controller 1 is connected with the actuator 2, the actuator 2 comprises an upper valve plate 201 and a lower valve plate 202, and the controller 1 controls the airflow area entering the SDPF carrier by controlling the opening degree of the upper valve plate 201 and the lower valve plate 202 so as to adjust the number of the channels through which the SDPF carrier can pass; in another aspect, a method for controlling an apparatus for improving SDPF low temperature startability is provided, including: s1: obtaining an exhaust inlet parameter; s2: calculating the most appropriate flow control ratiok best (ii) a S3: according to the most suitable circulation control ratiok best Obtaining the optimal opening of the exhaust valve; s4: and controlling the exhaust valve through the opening parameter of the exhaust valve. The invention has simple structure and flexible temperature rise control, and can improve the temperature rise rate of different SDPF carriers.
Description
Technical Field
The invention relates to the field of power machinery and engineering, in particular to a device for improving the low-temperature starting performance of SDPF and a control method thereof.
Background
The diesel engine is widely applied to the fields of transportation, agricultural machinery, engineering machinery and the like due to good dynamic property and economy. However, the diesel engine generates more particulate matters and nitrogen oxide (NOx) emissions, which cause great pollution to the atmospheric environment and also pose great threat to the health of residents.
A diesel particulate trap (DPF) is capable of trapping particulate matter, preventing the particulate matter from being discharged to the atmosphere. The DPF can accumulate particulate matters continuously in the using process, so that the exhaust back pressure is increased, and the normal work of the diesel engine is influenced. Therefore, the temperature of the particulate matter trapped in the DPF is generally raised by adding a catalyst or raising the temperature by injecting oil, so that combustible substances such as soot and organic matter in the particulate matter are oxidized to form gas, and the gas is discharged to the atmosphere.
And a Selective Catalytic Reduction (SCR) capable of selectively catalytically reducing NOx by a catalyst through ammonia gas decomposed from injected urea, thereby reducing NOx emissions.
Because of the space limitation of the light diesel vehicle, the SDPF-SCR catalyst is coated on the surface of the DPF, thereby effectively utilizing the space of the postprocessor and reducing the cost. And because the SCR catalyst has extremely low reaction efficiency at low temperature, urea is not sprayed at low temperature generally, so that the emission of low-temperature NOx is ultrahigh.
Disclosure of Invention
In order to solve the above problems, the present invention provides an apparatus for improving the low temperature starting performance of SDPF and a control method thereof.
The purpose of the invention is realized by the following technical scheme: a device for improving the SDPF low-temperature starting performance comprises an SDPF carrier, an actuator 2 and a controller 1; the actuator 2 is arranged at the inlet side of the SDPF carrier, the controller 1 is connected with the actuator 2, the actuator 2 comprises an upper valve plate 201 and a lower valve plate 202, and the controller 1 controls the airflow area entering the SDPF carrier by controlling the opening degree of the upper valve plate 201 and the lower valve plate 202 so as to adjust the number of the channels through which the SDPF carrier can pass.
The controller 1 comprises a control MAP, the controller 1 calculates control parameters by reading the engine speed, the engine torque, the engine air inflow, the engine oil injection quantity and the exhaust temperature data at the SDPF carrier outlet in the engine ECU and contrasting the control MAP, and the actuator 2 is controlled by the control parameters.
A control method of a device for improving the low-temperature starting performance of SDPF comprises the following steps:
s1: obtaining an exhaust inlet parameter;
s2: calculating the most appropriate flow control ratio k best ，；
S3: according to the optimum exhaust heating power P heat-best Obtaining the optimal opening of the exhaust valve;
s4: and controlling the exhaust valve through the opening parameter of the exhaust valve.
Different from the common mode of improving the exhaust temperature by throttling, the invention improves the heat generated by pressure loss, the heat generation process is carried out on the wall surface of the SDPF carrier, the heat transfer rate of the airflow and the wall surface is greatly increased after the flow speed is improved, the number of channels of the SDPF carrier required to be heated is reduced, and the efficiency of heating the SDPF carrier is greatly improved.
The invention has the beneficial effects that: the device is simple and the cost is low; the SDPF carrier can be rapidly heated, including the exhaust temperature and the SDPF carrier temperature are increased, so that the time of the SDPF carrier in a low-temperature low-efficiency working state is reduced, and the NOx emission is reduced; by controlling the opening of the exhaust valve, the temperature rise control is flexible, and the temperature rise rates of different exhaust SDPF carriers are improved.
Drawings
Fig. 1 is a schematic structural view of an apparatus for improving SDPF low temperature starting performance according to the present invention.
FIG. 2 is a schematic diagram of an actuator for an apparatus for improving the cold start performance of an SDPF according to the present invention.
FIG. 3 is a flow chart of a method for controlling an apparatus for improving the low temperature starting performance of an SDPF according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
In order to achieve the purpose, the invention adopts the following technical scheme: as shown in fig. 1 and 2: an apparatus for improving the low-temperature starting performance of SDPF, including SDPF carriers, actuator 2 and controller 1; the actuator 2 is arranged at the inlet side of the SDPF carrier, the controller 1 is connected with the actuator 2, the actuator 2 comprises an upper valve plate 201 and a lower valve plate 202, and the controller 1 controls the airflow area entering the SDPF carrier by controlling the opening degree of the upper valve plate 201 and the lower valve plate 202 so as to adjust the number of the channels through which the SDPF carrier can pass.
The controller 1 comprises a control MAP, the controller 1 calculates control parameters by reading the engine speed, the engine torque, the engine air input, the engine oil injection quantity and the exhaust temperature data at the SDPF carrier outlet in the engine ECU and contrasting the control MAP, and the actuator 2 is controlled by the control parameters.
As shown in fig. 3, a method for controlling an apparatus for improving a low temperature starting performance of SDPF includes an apparatus for improving a low temperature starting performance of SDPF, comprising the steps of:
s1: and acquiring exhaust inlet parameters, and acquiring the current engine working condition, exhaust temperature, NOx content and the carbon loading capacity of the SDPF carrier output by the carbon loading capacity estimation model by the controller through an engine controller ECU and an aftertreatment controller ACU.
S2: calculating the most appropriate flow control ratio k best The specific calculation process is as follows:
first, let the original SDPF wall flow area be S 0 The number of the channels is N 0 The original flow velocity of the air flow is v 0 After controlling the passing area, the number of available channels is N 1 The passable area is in direct proportion to the number of passable channels and is S 1 Flow-through control ratio k:
k＝N 0 /N 1 ＝S 0 /S 1 ，
the flow velocity of the air flow in the single pore channel is controlled after the quantity of the circulation pore channels is controlled
The pressure loss experienced by the airflow as it passes through the SDPF carrier wall is typically Δ p ═ Av 2 In this form, it can be said that the flow pressure loss Δ p after the control of the apparatus 1 For reference pressure loss Δ p before control 0 K of (a) 2 Doubling, namely:
Δp 1 ＝Av 1 2 ＝A(kv 0 ) 2 ＝k 2 Av 0 2 ＝k 2 Δp 0
here,. DELTA.p 0 Obtaining the pressure loss deltap of the SDPF carrier through engine model calibration 0 The concrete mode is as follows:
through calibration experiments of the engine under different working conditions, the pressure loss of the SDPF carrier under different carbon loading conditions is obtained
Wherein: Δ p 0 In order to be a reference pressure loss,
for exhaust mass flow, T is exhaust temperature, m c The carbon loading of the SDPF carrier output by the carbon loading estimation model.
Thus, the exhaust heating power is
Rho is exhaust density, the exhaust density can be obtained by calculating the fuel injection flow and the intake flow of the engine, and because the calculation precision required by the invention for heating is not high, the approximate density can be regarded as a constant value, and 1kg/m is taken 3 ，
Is the exhaust mass flow.
Then, the heating power obtained per unit mass of exhaust gas, i.e., the exhaust gas heating power density, is:
the working condition of the engine, the exhaust temperature at the outlet of the SDPF carrier and the exhaust target temperature at the outlet of the SDPF carrier are integrated, under the condition of ensuring the normal work of the engine, k is increased as much as possible, so that the SDPF carrier is rapidly heated, the cold start performance of the SDPF carrier is improved, and the working condition of the SDPF carrier is formulated according to a proper mode
MAP of (c).
Wherein, T exgas Is the exhaust temperature at the SDPF carrier outlet, n is engine speed, and Torque is engine Torque.
Then the most suitable flow-through control ratio k best Comprises the following steps:
the optimal exhaust heating power is as follows:
s3: according to the optimum exhaust heating power P heat-best Obtaining the optimal opening of an exhaust valve:
the opening of the exhaust valve is controlled to make the flow area reach S 1 ：
S 1 ＝S 0 /k best
Wherein S is 0 Is the wall surface flow area, k, of the original SDPF carrier best The most suitable flow control ratio.
S4: the exhaust valve is controlled through the opening of the exhaust valve.
The above-described embodiments are merely exemplary in nature and are intended to illustrate the principles of the invention and the technical solutions thereof, and those skilled in the art can make various modifications and substitutions of the embodiments without departing from the spirit and scope of the invention. Accordingly, it is intended that all modifications and variations be covered by the appended claims without departing from the spirit and scope of the invention.
Claims (2)
1. A control method of a device for improving the low-temperature starting performance of SDPF uses a device for improving the low-temperature starting performance of SDPF, and the device for improving the low-temperature starting performance of SDPF comprises an SDPF carrier, an actuator (2) and a controller (1); the actuator (2) is arranged at the inlet side of the SDPF carrier, the controller (1) is connected with the actuator (2), the actuator (2) comprises an upper valve plate (201) and a lower valve plate (202), and the controller (1) controls the area of airflow entering the SDPF carrier by controlling the opening degree of the upper valve plate (201) and the lower valve plate (202) so as to adjust the number of channels through which the SDPF carrier can pass; the control method comprises the following steps:
s1: obtaining an exhaust inlet parameter;
s2: calculating the most appropriate flow control ratio k best The specific calculation process is as follows:
first, the original SDPF wall flow area is set to S 0 The number of the channels is N 0 The original flow velocity of the air flow is v 0 After controlling the passing area, the available pore canal number is N 1 The passable area is in direct proportion to the number of passable channels and is S 1 Flow-through control ratio k:
k＝N 0 /N 1 ＝S 0 /S 1 ，
the flow velocity of the air flow in the single pore channel is controlled after the quantity of the circulation pore channels is controlled
The pressure loss experienced by the airflow as it passes through the SDPF carrier wall is Δ p ═ Av 2 Form, and thus the flow-through pressure loss Δ p after control by the device 1 For reference pressure loss Δ p before control 0 K of (a) 2 Doubling, namely:
Δp 1 ＝Av 1 2 ＝A(kv 0 ) 2 ＝k 2 Av 0 2 ＝k 2 Δp 0
here,. DELTA.p 0 Obtaining the pressure loss delta p of the SDPF carrier through calibration of an engine model 0 The specific mode is as follows:
through calibration experiments of the engine under different working conditions, the pressure loss of the SDPF carrier under different carbon loading conditions is obtained
Wherein: Δ p 0 In order to be a reference pressure loss,
for exhaust mass flow, T is exhaust temperature, m c The carbon capacity of the SDPF carrier output by the carbon capacity estimation model is calculated;
thus, the exhaust heating power is
Rho is exhaust density, the exhaust density can be obtained through calculation of fuel injection flow and air intake flow of the engine, the density is a constant value, and 1kg/m is taken 3 ，
Is the exhaust mass flow rate;
then, the heating power obtained per unit mass of exhaust gas, i.e., the exhaust gas heating power density, is:
the working condition of the engine, the exhaust temperature at the outlet of the SDPF carrier and the target exhaust temperature at the outlet of the SDPF carrier are integrated, and k is increased as much as possible under the condition that the normal work of the engine is ensured, so that the SDPF carrier is rapidly heated, the cold starting performance of the SDPF carrier is improved, and the working condition is formulated according to a proper mode
MAP of (c);
wherein, T exgas Is the exhaust temperature at the outlet of the SDPF carrier, n is the engine speed, and Torque is the engine Torque;
then the most suitable flow-through control ratio k best Comprises the following steps:
the optimal exhaust heating power is as follows:
s3: according to the optimum exhaust heating power P heat-best Obtaining the optimal opening of the exhaust valve;
s4: and controlling the exhaust valve through the opening parameter of the exhaust valve.
2. The method of claim 1 for controlling an apparatus for improving SDPF low temperature startability, wherein: the optimal exhaust valve opening should make the flow area reach S 1 ：
S 1 ＝S 0 /k best
Wherein S is 0 Is the wall surface flow area, k, of the original SDPF carrier best The most suitable flow control ratio.
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